The Permian Khuff-C carbonate reservoir in the ‘Uthmaniyah sector of Saudi Arabia's super giant Ghawar Field was discovered by exploratory drilling in 1982 (Figure 1). The reservoir is a prolific producer of nonassociated gas and condensate but its porosity and permeability distribution is complex and primarily controlled by the depositional facies distribution and its later diagenesis.

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Khuff sediments were deposited in subtidal and gently dipping tidal flats in an extremely arid environment. Khuff-C reservoir facies vary in quality as a result of their diagenetic history. Khuff-C porosity varies from about 30% to less than 5%. Some parts of...

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